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# File Name: system_monitor.sh
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#!/bin/bash
clear
if [[ $# -eq 0 ]]
then
#define variable reset_terminal
reset_terminal=$(tput sgr0)
#check OS type
os=$(uname -o)
echo -e '\E[32m' "os type："$reset_terminal $os
#check OS release version and name
os_name=$(cat /etc/issue | grep -e "Server")
echo -e '\E[32m' "os release version and name："$reset_terminal $os_name
#check architecture
architecture=$(uname -m)
echo -e '\E[32m' "architecture："$reset_terminal $architecture
#check kernel release
kernelrelease=$(uname -r)
echo -e '\E[32m' "kernel release："$reset_terminal $kernelrelease
#check hostname
hostname=$(hostname)
echo -e '\E[32m' "hostname："$reset_terminal $hostname
#check internal ip
internalip=$(hostname -i)
echo -e '\E[32m' "internal ip："$reset_terminal $internalip
#check external ip
externalip=$(curl -shttp://ipecho.net/plain) echo -e '\E[32m' "external ip："$reset_terminal $externalip
#check dns
dns=$(cat /etc/resolv.conf | grep -E "\<nameserver[ ]+" | cut -d " " -f2)
echo -e '\E[32m' "dns："$reset_terminal $dns
#check if connected to internet or not
ping -c 2 baidu.com >> /dev/null && echo "Internal:Connected" || echo "Internal:Disconnected"
#check logged in users
who > /tmp/who
echo -e '\E[32m' "logged in users："$reset_terminal && cat /tmp/who
rm -rf /tmp/who
fi
#system use 系統使用內存
systemUserage=$(awk '/MemTotal/{total=$2}/MemFree/{free=$2}END{print (total-free)/1024}' /proc/meminfo)
echo -e '\E[32m' "systemUserage："$reset_terminal $systemUserage'M'
#application usr 應用使用內存
applicationUserage=$(awk '/MemTotal/{total=$2}/MemFree/{free=$2}/^Cached/{cache=$2}/Buffers/{buffer=$2}END{print (total-free-cache-buffer)/1024}' /proc/meminfo)
echo -e '\E[32m' "applicationUserage："$reset_terminal $applicationUserage'M'
#load average 操作系統負載
loadaverage=$(top -n 1 -b | grep 'load average' | awk '{print $11 $12 $13}')
echo -e '\E[32m' "loadaverage："$reset_terminal $loadaverage
#磁盤使用率
dfused=$(df -hP | grep -vE 'Filesystem|tmpfs' | awk '{print $1" "$5}')
echo -e '\E[32m' "dfused："$reset_terminal $dfused
